add hw2

node_modules/lodash/invokeMap.js

@@ -0,0 +1,41 @@
+var apply = require('./_apply'),
+    baseEach = require('./_baseEach'),
+    baseInvoke = require('./_baseInvoke'),
+    baseRest = require('./_baseRest'),
+    isArrayLike = require('./isArrayLike');
+
+/**
+ * Invokes the method at `path` of each element in `collection`, returning
+ * an array of the results of each invoked method. Any additional arguments
+ * are provided to each invoked method. If `path` is a function, it's invoked
+ * for, and `this` bound to, each element in `collection`.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.0.0
+ * @category Collection
+ * @param {Array|Object} collection The collection to iterate over.
+ * @param {Array|Function|string} path The path of the method to invoke or
+ *  the function invoked per iteration.
+ * @param {...*} [args] The arguments to invoke each method with.
+ * @returns {Array} Returns the array of results.
+ * @example
+ *
+ * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
+ * // => [[1, 5, 7], [1, 2, 3]]
+ *
+ * _.invokeMap([123, 456], String.prototype.split, '');
+ * // => [['1', '2', '3'], ['4', '5', '6']]
+ */
+var invokeMap = baseRest(function(collection, path, args) {
+  var index = -1,
+      isFunc = typeof path == 'function',
+      result = isArrayLike(collection) ? Array(collection.length) : [];
+
+  baseEach(collection, function(value) {
+    result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
+  });
+  return result;
+});
+
+module.exports = invokeMap;